During 2008, college work-study students earned a mean of $1478. Assume that a sample consisting of 45 of the work-study students at a large university was found to have earned a mean of $1503 during that year, with a standard deviation of $210. Would a one-tail test at the 0.05 level suggest the average earnings of this universitys work-study students were significantly higher than the national mean?

I have difficulties with determining hypothesis and alternative hypothesis. Also I cannot determine regions of rejection and non-rejection. Please answer the task above.